Species details: Click on each item to see an explanation of that item (Note: opens a new window)

More or less erect annual herb, sometimes rooting at the nodes. Leaves opposite, narrowly lanceolate to ovate, 3.5 - 9.5 cm long, usually with at least some hairs, particularly on the veins. Petiole up to 3 cm long. Flowers in axillary clusters. Bracts and calyx with long woolly hairs. Corolla 5-7 mm long, pale to deep mauve or violet; base of the lower lip often white with darker mauve lines or spots.